F25J 3/04406
Using a dual pressure main column system
Official title: {using a dual pressure main column system (F25J3/0446, F25J3/04624, F25J3/04636 and F25J3/04715 take precedence)}
F25J3/04406 (Using a dual pressure main column system) appears on 848 US grants and 528 published applications in this corpus.
Search patents in F25J- Granted patents
- 848
- Published applications
- 528
- Assignees
- 114
- Inventors
- 759
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 7 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 12 | 0 |
| 1984 | 5 | 0 |
| 1985 | 8 | 0 |
| 1986 | 7 | 0 |
| 1987 | 14 | 0 |
| 1988 | 16 | 0 |
| 1989 | 19 | 0 |
| 1990 | 11 | 0 |
| 1991 | 17 | 0 |
| 1992 | 34 | 0 |
| 1993 | 27 | 0 |
| 1994 | 34 | 0 |
| 1995 | 41 | 0 |
| 1996 | 25 | 0 |
| 1997 | 42 | 0 |
| 1998 | 38 | 0 |
| 1999 | 42 | 0 |
| 2000 | 29 | 0 |
| 2001 | 52 | 10 |
| 2002 | 29 | 18 |
| 2003 | 34 | 14 |
| 2004 | 13 | 17 |
| 2005 | 7 | 9 |
| 2006 | 8 | 14 |
| 2007 | 8 | 17 |
| 2008 | 9 | 19 |
| 2009 | 7 | 18 |
| 2010 | 2 | 17 |
| 2011 | 3 | 19 |
| 2012 | 4 | 15 |
| 2013 | 5 | 23 |
| 2014 | 9 | 14 |
| 2015 | 14 | 18 |
| 2016 | 13 | 39 |
| 2017 | 15 | 38 |
| 2018 | 24 | 33 |
| 2019 | 32 | 21 |
| 2020 | 23 | 22 |
| 2021 | 15 | 28 |
| 2022 | 7 | 24 |
| 2023 | 17 | 31 |
| 2024 | 18 | 24 |
| 2025 | 19 | 14 |
| 2026 | 13 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F25J 3/04412In a classical double column flowsheet, i.e. with thermal coupling by a737
- F25J 3/04418With thermally overlapping high and low pressure columns69
- F25J 3/0443A main column system not otherwise provided58
- F25J 3/04424Without thermally coupled high and low pressure columns, i.e. a so-called split39
Recent patents
- Dual temperature liquid oxygen subcooling in an air separation unit22 Sep 2026US 12,742,591 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Air separation unit and method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column15 Sep 2026US 12,736,282 B2Praxair Technology, Inc.
- Method and apparatus for cryogenic air separation8 Sep 2026US 12,729,907 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Apparatus and process for improved argon recovery8 Sep 2026US 12,729,908 B2Air Products and Chemicals, Inc.
- Air separation unit and air separation method25 Aug 2026US 12,716,651 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process and apparatus for air separation by cryogenic distillation1 Oct 2026US 2026/0298532 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- System for producing compressed hydrogen13 Aug 2026US 2026/0234824 A1Ceres Intellectual Property Company Limited
- Process and apparatus for intermittent liquefaction operation that can support continuous air separation processing6 Aug 2026US 2026/0227123 A1Air Products and Chemicals, Inc.
- Air separation method and air separation device30 Jul 2026US 2026/0218981 A1Taiyo Nippon Sanso Corporation
- Process and apparatus for producing argon by cryogenic air separation23 Jul 2026US 2026/0210624 A1
Most cited
By later US patents
- Hydrocarbon combustion power generation system with CO2 sequestration337US 6,389,814 B1Clean Energy Systems, Inc. · 2002
- Power plant with carbon dioxide capture and zero pollutant emissions254US 5,724,805 AUniversity of Massachusetts Lowell · 1998
- Hydrocarbon combustion power generation system with CO2 sequestration216US 7,043,920 B2Clean Energy Systems, Inc. · 2006
- Hydrocarbon combustion power generation system with CO2 sequestration209US 6,170,264 B2Clean Energy Systems, Inc. · 2001
- Hydrocarbon combustion power generation system with CO2 sequestration163US 6,598,398 B2Clean Energy Systems, Inc. · 2003